451961891 has 8 divisors (see below), whose sum is σ = 472020000. Its totient is φ = 431937792.

The previous prime is 451961879. The next prime is 451961929. The reversal of 451961891 is 198169154.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 451961891 - 2⁶ = 451961827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (451967891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20861 + ... + 36593.

It is an arithmetic number, because the mean of its divisors is an integer number (59002500).

Almost surely, 2^451961891 is an apocalyptic number.

451961891 is a deficient number, since it is larger than the sum of its proper divisors (20058109).

451961891 is a wasteful number, since it uses less digits than its factorization.

451961891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17005.

The product of its digits is 77760, while the sum is 44.

The square root of 451961891 is about 21259.3953582881. The cubic root of 451961891 is about 767.4214590695.

The spelling of 451961891 in words is "four hundred fifty-one million, nine hundred sixty-one thousand, eight hundred ninety-one".